Abstract
Research interests of compact magnetically levitated motors have been strongly increased in development of durable and biocompatible mechanical circulatory support (MCS) devices for pediatric heart disease patients. In this study, an ultra-compact axial gap type self-bearing motor with 5-degrees of freedom (DOF) active control for use in pediatric MCS devices has been developed. The motor consists of two identical motor stators and a centrifugal levitated rotor. This paper investigated a design improvement of the magnetic circuit for the self-bearing motor undergoing development in order to diminish energy input by enhancing magnetic suspension and rotation performances. Geometries of the motor were refined based on numerical calculation and three-dimensional (3D) magnetic field analysis. The modified motor can achieve higher suspension force and torque characteristics than that of a previously developed prototype motor. Oscillation of the levitated rotor was significantly suppressed by 5-DOF control over rotating speeds up to 7000 rpm with lower energy input, indicating efficacy of the design refinement of the motor.
Highlights
Mechanical circulatory support (MCS) is widely used for heart disease therapy
This study developed a compact pediatric mechanical circulatory support (MCS) device with a novel self-bearing motor utilizing a 5-degrees of freedom (DOF)-control concept that was newly developed in our laboratory, and the developed device demonstrated noncontact suspension and sufficient pump performance [25,26,27,28]
The magnetic flux density produced by the rotor permanent magnets did not significant difference between the prototype motor and the improved motor
Summary
Mechanical circulatory support (MCS) is widely used for heart disease therapy. Clinically available and implantable MCS devices are not applicable for pediatric patients, which have small body surface area (BSA < 0.7 mm2 ) due to anatomical limitations [1,2]. Almost all pediatric patients have to rely on using EXCOR pediatric ventricular assist device (VAD), which is a extracorporeal pulsatile flow pump developed by Berlin Heart Inc. in Germany [3]. There have been increasing research interests in pediatric heart treatment with implantable rotary MCS devices designed for pediatric circulatory support [4]. In 2010, MCS device development for pediatric patients was supported as a national project named PumpKIN
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